Building slab



" Jam2o,1942; A. A. HEER'EN BUILDAING SLAB Filed 001:. 6, 1938 w o .fl

- INVENTOR AR THUR A HEEREN Patentecl Jan. 20, 1942 TES PATEN FFICEStates Gypsum poration of Illinois Company, Chicago, 111., a cor-.

Application October 6, 1938, Serial No. 233,620

7 Claims.

This invention relates to building constructions and has reference moreparticularly to building slabs of cementitious material having metalbound edges.

Building slabs are commonly constructed of cementitious compositionshaving as abase gypsum, Portland cement, etc. These slabs are usuallyprovided with sheet metal tongue and groove edges for interfiitting onewith the other to form a floor or other structural part of a building.The metal reinforced edges improve the strength of the slabs and alsoprevent chipping of the edges during handling, shipping and erection. Inaslab of this nature, such as that disclosed in patent to Heeren andJohnson No. 2,014,841, it has been found that margins of the metaledging have a tendency to work loose from the faces of the ocmentitiousslab, as when the slab is sawed to shorter length, so that the fullreinforcing value of the metal edging is not obtained.

An object of this invention therefore, is to provide marginal anchoringmeans for the metal edging to prevent the edges of the metal runner fromloosening from the faces of the slab.

Another object of the invention is to obtain maximum reinforcing valuefrom the edge. runners of a slab even if the slab is sawed to shorterlength.

A further object of the invention is to provide marginal anchoring meansfor the edge runner which will not produce cleavage planes in the slab;also to improve building slabs in other respects hereinafter specifiedand claimed.

- slab may be of -any convenient size, such as One edge and end of eachslab is provided with tongues II and the opposed edge and end withgrooves I2. The groove l2 is'formed by a lower ledge l3 and an upperledge M, the former being somewhat shorter than the latter so as toprovide clearance for the reception of an attaching clip l5. Nails l6attach the body of clip I5 to the-lower ledge l3, and a hook I! on thelower side of said clip engages under the up- 66 clined flanges.

per flange l8 of a structural beam I9. The tongues II and grooves i2 are.lined with mating metal runners 20 and 2| respectively, said runnershaving inwardly turned flanges 22 lying in the planes of the slab faces.The salient feature of my invention comprises the means for anchoringthe flanges 22 to the slab H). In order to accomplish this, I provide aninwardly inclined flange 23 on the inner edge of each flange 22.Expanded metal loops 24'are formed on the inner edge of the flanges 23,said loops being embedded in the cementitious body In and forming a firmanchorage for the flanges '22. A suitable reinforcing mat 25 of weldedwire or the like is'also embedded in the body of the slab. Thus when theslab is sawed to short lengths, the flanges 22 will not be separatedfrom the body of the slab as heretofore, thus resulting in a floor slabhaving a uniformly high strength. No cleavage planes are formed in theslab due to the variable character of the loops 24.

I would state in conclusion that, while the example illustratedconstitutes a practical embodiment of my invention, I do not'wish tolimit my-- self precisely to these details, since manifestly the samemay be considerably varied without departing from the spirit of theinvention as defined in the appended claims.

Having thus described my invention, I claim I lying in the planes of thefaces of said body,

and anchoring loops extending obliquely from the inner edges of saidflanges and embedded in said body in substantially opposed spacedrelation, said loops being so formed as to prevent the formation therebyof cleavage planes through said body.

2. In a building slab, a body of cementitious material, tongue andgroove metal runner embracing opposite edges of said body, inwardlyextending flanges on said runners, said flanges lying in the planes ofthe faces of said body, in-

clined anchoring flanges formed on the inner edges of said first flangesand extending into the body of said slab substantially opposite eachother, and anchoring loops struck out from the inner edges of saidinclined flanges for efl'ecting secure anchoring of said runners and forpreventing the formation of cleavage planes through said bodybetweensaid inner'ed'ges of said in- 3. In a building slab, a body ofcementitious" material forming a relatively thin slab on the order oftwo inches in thickness, tongue and groove metal runners embracingopposite edges of said body, inwardly extending flanges on said runnerslying in the planes of the faces 'of said body, inclined anchoringflanges formed on the inner edges of said first flanges and extendinginto the relatively thin body of said slab substantially opposite eachother, and anchoring means struck out from the innermost edges of saidinclined flanges for increasing the anchoring eifect of said flanges andfor preventing the formation of cleavage planes through said relativelythin body at said innermost edges.

4. A precast slab of set cementitious material having metal membersembracing opposite edge portions, said members having complementaryfaces, each of said members having flanges extending rearwardly fromsaid complementary faces substantially in the plane of the faces of saidslab, and portions extending inwardly from said flanges and embedded insaid slab for anchoring said metal members thereto, said portionscomprising expanded metal loops extending in planes at an obliqu angleto said portions disposed substantially opposite each other tightly toanchor said members to said slab without. creating a cleavage planethrough said cementitious material.

from said flanges, said'portions terminating in expanded metal loopsextending in planes at an oblique angle to said portions disposedsubstantially opposite each other within said slab secure- 1y to anchorsaid metal members thereto without creating cleavage planes through therelatively thin slab of cementitious material. 8. A precast slab of setcementitious material having metal members embracing opposite edgeportions thereof, said members having complementary faces, each of saidmembers having flanges extending rearwardly from said complementaryfaces substantially in the planes of the loops whose strands lie athwartof the planes of I said portions so as to intercept any potential line Iof cleavage that might develop in the slab along the planes of saidportions.

7. In a building slab having a cementitious body and tongue and groovemetal runners embracing opposite edgesof said body, the improvementcomprising rearwardly extending flanges integral with said runners andlying substantially in'the facial plane, of the slab, inwardly extendingcontinuations of said flanges embedded in the body of the slab, aportion of said continuations being slit and expanded so as to produce aseries of loops whose strands are inclined to the plane of thecontinuations, thereby intercepting any potential lines of cleavagecapable of devel-

